1. Release and regenerate the sorbent close to water saturation.

2. Stress sensitivity has relationship with water saturation of reservoirs.

3. As time progresses, the water saturation profile becomes closer to the steady-state profile, which corresponds to the soil-water characteristic curve of the coarse sand.

4. The effects of critical water saturation, permeability decrease coefficient, maximum drag factor and flow rate on gas-liquid relative permeability are discussed.

5. By a newly - established interpretation model, water saturation and water holdup can be derived from DCO.

6. Characteristic solution and finite difference solution to the model are derived respectively and water saturation distribution curves are presented.

7. Tight gas wells are generally characterized by low porosity, low permeability and high water saturation.

8. However under the condition of high salinity and high water saturation the effect is little.

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9. Based on the analysis of logging data, it is found that effect of porosity and shale content on acoustic velocity is heavier than that of water saturation on it.

10. This paper presents some qualitative evaluation methods, new model S B to calculate water saturation has been used and actual data of well Qu 10 verify that this model is better than Archie formula.

11. Well test data of such reservoirs are hard to analyze by conventional well test models, which should be properly modified when the connate water saturation is high.

12. It is found that the oil effective permeability of low middle porous sandstone is related with the porosity, water saturation and shale volume of formation.

13. The differences of impacts of wettability on electric properties are caused by the differences of reservoir connectivity and heterogeneity at low water saturation.

14. Log data of well SU-1 and SU-3 in the very shaly formation in Hailaer basin are interpreted with the model proposed in the paper, then the calculated water saturation with test results is compared.

15. Characteristic solution and finite difference solution are derived respectively and water saturation distribution curves are presented and the law of the moving boundary is found.

16. The minimal value of porosity is around 2.5 % though throat radius method and porosity - water saturation method.

17. The minimal value of porosity is around 5 % though throat radius method and porosity - water saturation method.